Add user context notes field to timeline tool

Adds an optional textarea below the main text input where users can provide
clarifications to guide the LLM — e.g. year anchors, actor aliases, or focus
instructions. Notes are injected into the prompt as a clearly delimited block
and translated across all four UI languages (en/no/uk/pl).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

includes/LegalTools.php

@@ -289,7 +289,8 @@ PROMPT;
         string $focus              = 'all',
         string $confidenceFilter   = 'all',
         bool   $includeRelative    = true,
-        bool   $includeBackground  = true
+        bool   $includeBackground  = true,
+        string $userNotes          = ''
     ): array {
         $text   = $this->requirePasteText($text);
         $engine = in_array($engine, ['azure_mini', 'azure_full', 'gpu'], true) ? $engine : 'azure_mini';
@@ -316,8 +317,12 @@ PROMPT;
             ? ''
             : "\nDo NOT extract relative, recurring, or conditional date references — extract only events with determinable absolute dates (date_type=absolute).";
 
+        $userNotesBlock = $userNotes !== ''
+            ? "\n\nUser-provided context notes (use these to resolve ambiguities, not as source events):\n---\n" . $userNotes . "\n---"
+            : '';
+
         $prompt = <<<PROMPT
-Build a chronological timeline from the pasted text in {$locale}.
+Build a chronological timeline from the pasted text in {$locale}.{$userNotesBlock}
 
 Extract ALL dates, deadlines, milestones, and temporal references.{$focusInstruction}{$backgroundInstruction}{$relativeInstruction}